linux-kernel - Re: [RFC] perf/core: allow ftrace for functions in kernel/event/core.c

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Date:   Tue, 26 May 2020 21:46:29 +0000
From:   Song Liu <songliubraving@...com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     linux-kernel <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        "Masami Hiramatsu" <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "Jiri Olsa" <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Subject: Re: [RFC] perf/core: allow ftrace for functions in
 kernel/event/core.c



> On May 26, 2020, at 2:39 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> On Tue, May 26, 2020 at 02:28:26PM -0700, Song Liu wrote:
>> It is useful to trace functions in kernel/event/core.c. Allow ftrace for
>> them by removing $(CC_FLAGS_FTRACE) from Makefile.
> 
> Did you try using the ftrace event with perf with this on?

I have tried a few things, like 

  perf stat -e probe:perf_read -I 1000
  perf record -e probe:__x64_sys_perf_event_open -aR

They all work fine. 

Do you have some tricky functions that we should double check?

Thanks,
Song